Class: CVFFI::ImagePatch::CircularMask

Inherits:
Mask
  • Object
show all
Defined in:
lib/opencv-ffi-wrappers/features2d/image_patch.rb

Instance Attribute Summary

Attributes inherited from Mask

#size

Instance Method Summary collapse

Methods inherited from Mask

make

Constructor Details

#initialize(size) ⇒ CircularMask

Returns a new instance of CircularMask.



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# File 'lib/opencv-ffi-wrappers/features2d/image_patch.rb', line 44

def initialize(size)
  super(size)

  @mask = build_circle( size/2.0 )
end

Instance Method Details

#build_circle(radius) ⇒ Object 



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# File 'lib/opencv-ffi-wrappers/features2d/image_patch.rb', line 50

def build_circle( radius )
  ## Returns row-major Array of Arrays
  center = CVFFI::Point.new(radius,radius)
  @mask = Array.new(radius.ceil) { |i|
    Array.new(radius.ceil) { |j|
      pt = CVFFI::Point.new( 0.5 + j, 0.5 + i )
      center.l2distance( pt ) <= radius ? true : false
    }
  }

  # Now mirror the one quadrant across Y, then across X
  @mask.map! { |a| a + a.reverse }
  @mask + @mask.reverse
end

#to_a ⇒ Object 



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# File 'lib/opencv-ffi-wrappers/features2d/image_patch.rb', line 69

def to_a
  @mask.map { |m| m.map { |m| m ? true: false } }
end

#valid?(i, j) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/opencv-ffi-wrappers/features2d/image_patch.rb', line 65

def valid?(i,j)
  @mask[i][j]
end